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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feee3578288b6681757bd27e46b1d45b6f19eb789f9cc18a9ee912b31008af55' 
  AND token = 'qAV2M+Lx95cJDQSo1D9Ghfti6Ry6YxJYZBH5RHR5DAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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