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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5eb018df8ab6197fc3de110d50672e6953b4b01a3accda8b612247419004e7' 
  AND token = '9VwKmuMF0pVaByvZdWTakFIrkfaE9eX0bF6YVVJJy7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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