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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ac66d149502d25fad464cd482904a57cf32c7c9b8e9291dbeb4303d652422c' 
  AND token = 'RKkN2t5U0oarnvV8Q4ys9ObQtse+jZuYWsggN+Igh+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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