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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a37866847f519ba1d8f7f0fe93075968bbd45ffd3eb746cf4fd200faeb34af' 
  AND token = '5ujbXhjULpmQLJ2wNoms4K5QRsZJoB8lVldxAC4MMb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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