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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fa216faee3b7ae683fd7ae0ff9fda178de63f936d3aedb99d41ff62d5cb6f2' 
  AND token = 'AQ4ANZFfLN3WdCOVfkMwypFWk8W3/Rw8gFkIHQPIekA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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