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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfc72c8573378208bb1d1dd88737c8a7fe48445ec5f68c3b1f95a00e2de1fba' 
  AND token = 'ouWbbaW3rioRutxch5NVb7njU3+7wu7gm+7sA1ciuK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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