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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ab55d901399a4c2ee16ba98c4e6cf012db6c68a7fe6994e031e95e11054f3e' 
  AND token = 'F+LveWXn9JN7Z85zY6y9ze3PAgTROiX6cnrSVAybIEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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