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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9473f8e3d1a19b7b597e9ee270a48d1277978ad996b01e3a1a45d13840cc2555' 
  AND token = 'gqP1ze32tZo+8zx7n+3bT6ljuNfLZm/cSQGzzfBv9Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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