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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de5ba9b4711287749b55882b6da4081ca7d8a52198fec4843541e8ab695ffed' 
  AND token = 'yZzEhUHQOuotJpMoW57RKYQs/GuqNqMz0RQht4jaAbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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