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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e65e51179a541ef83315aa0a3d7c3c53b3f572aedc917e2d655cfc41e6b0ea' 
  AND token = '2Q2Ojm21zGk0DEWg72TlNlFmtpzWjkd80ZUtiFFXH4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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