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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62265f4a7503532dc68754b7f6dcc38f8ecff810e460a174bd7354fddde97fbf' 
  AND token = 'CEQZxkrcmEXzzBLAMtnFcbAJulQ7XnUXJdx6Jmb5TqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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