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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e84770e4b46e60283b201fe93ac74e48aaec4e5f54f0079596d51262426a9be' 
  AND token = 'jmMJcQutBCu08+DQ+bD42SFvLXSL/JYblvSi65lB25g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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