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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93468488eb00b95f0b90a4e3d0fb1e9f7a527f0fbbd9f26c2fd3193367cf3ac' 
  AND token = 'wDIFCyEGeJTbnvZ325fMUoyqsCoN+mKS0EOj0slMXT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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