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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19003b55a9da84687d2eaa7cc666a4d772b518e6a0115efb8b717f1f0af66341' 
  AND token = 'uxgtlIlBAjpDPOahnLC5zB+5xowR+e8gtW8TRxzKAIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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