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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c2e2167a2315ea66b38f1203eace53d374e5ce536bbda39cb00ae96d913690' 
  AND token = 'N8Pr+Zmvoo/R7pPfjnx0eJt3uVcx2mkYHWeLF0Evmts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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