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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dfc5b198b0e8f5018630332e8091f0ea5a4df05e50f9b5105f3d4de5ffe53d' 
  AND token = 'Dkyp8sMnsk4peSlYBkvZP4D4h1l1kQSfwwQPZbTPOYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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