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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c64699cb141fce90132eaca5c76141dcef53985ed9f717b37ba7d8288505fa9' 
  AND token = '7//k+1QV/m79B3B1pXZcNnOeYJQaoC7H4o8XuQL+EcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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