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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f9002e14795b60acd7015a42f7f71444980bf75610a474db358e310ab22b3a' 
  AND token = '/Q/ucgIrXCxRXkI8Vzy6GDCnrOIDylk7poo3itKJ4E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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