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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3e60ef8c18044b38d21035f4ed7fb6ba20491a306b97f69f7f84ef020a22f2' 
  AND token = 'KtYvMlJ3BdmnfY7BO02AHjd5d4HKtLgO938Ke8eGzeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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