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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba23b04a73b73a43b96d87de9c5130275e0abf934f5b23d7f53d292602108856' 
  AND token = 'bayGSX7UOcZuc23GYMizgE9RIuTqvpfcIpW8W0KWavs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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