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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee30ec6e2b5b5e8dbad3671c00efbd6c29f6f02f01005a37b7056173d0870813' 
  AND token = 'PuDg15D6iW7cjLPzHI1wtCvECoaYQRHZ1MQX/geU+FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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