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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19966ddbb41f2a5df6acce5b34da001d987d59e636935c17a1beacafe31a1c7' 
  AND token = 'os8v8ZqXeCKmni3clR0Ek8fQHCLEdd8AH4OrkfxU8sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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