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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f697f599f34eec0fa9ce4e40a020ca74c8ceb80fe6ef746edb0bae670c9529' 
  AND token = 'XBuw5qAFE0YI2nk7Jzx9Zg9AVklhO9ViATARjmiZbhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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