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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184daeb76f693c5877463a472ec30de2f1f096e3eb53f73da450c82dacbea61d' 
  AND token = 'wUUIY5riUYS+43X7Y4ZPeMds+fFE29mA5QdadqG9AxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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