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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53fda7e4e0d7ec174cdbd6dca2fbb72333bacb4ee7d26d15f83b9d4677a9d4d' 
  AND token = 'GA3T/rFfKCjqiJbn/fOqzsb5/3iOW8f8rKt+MnZnmbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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