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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe0d0ce89764ae97e4a2d092c95b8bb4cdaae2c27895902879f85f5e82a3faa' 
  AND token = '/S6ozlzqP99XVxOx8TV2RRNGs0R22feLnK2l7LTiphw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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