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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db24348b77c5616ae6e08ac178213f79f0d2927727decb81cb630a29ef3d6118' 
  AND token = 't5UYruSunB1lse8nQbOiYydnqxRxkNBX9vqTFjwM47I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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