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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e028345c7828872f95fefc2d86de479c86aa952d46d9e50a6e53b369ddb70e9c' 
  AND token = 'nelwwkRm4s0zplSMXO0p6qESppaDFcmFSQ13M+kQeDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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