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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff9d11c43033437b3802f27ee117ca52b5b141275dc05ddb9f00dfbd4ed45d8' 
  AND token = 'BQ6p5k2qsdK1lkdxlFMRj1fbjn0zVKaDflq31VRz0fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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