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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fdd36e4058f8e05814dc6a4b037c6e7605228ae5ab5ab7b49b3f7e051fc9f5' 
  AND token = 'tOs0KXCD0g8VNxCUy2ykbeZq9GdyCyFwelKe+mebqUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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