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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabaf6f1b1cddef0a6a56c12eb44a6aa237fc9cfe7e54974c3cf79be2ad220dd' 
  AND token = 'wHhLy59imzfqI2DAfntStvgLDQA7kzi/xTIKxzJ0SXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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