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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceb978fbe3fd6690318cb59f973ff0c277137dd6d3fbfb55aeebd7b430f41d4' 
  AND token = '8OpdZRkC983cWzW07UJnoI/n3HV0KMH9PotnlvgEcfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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