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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d6762f80aaea018d07cb8ffcb7eb88fba61f362f6adf826aff7ebe58d9be24' 
  AND token = 'EvvKa6in+83bMQxnjTzGet2c4ofJTSi/UF6hUOiL9rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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