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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df4e5cda831defcb2dc6d5747a9b0898ce2ddbea3ea739d15be4c9af0aeb10b' 
  AND token = 'jAF3lI8Ge13ypOBYcdXX6yQJMW+BaNsNrduVpuTyWHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}