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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc9f00b8deeec412296d9e9844039e14022be621778fc17ff9f7f5e5182f488' 
  AND token = 'IkYIgDeMLBzo0keHN/U2vXnjma4McoeNQloQun0hsuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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