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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f5da1ec7565597c7f3daf216ea8c7730e1aaa19c87b96e7893ef12fda738e7' 
  AND token = 'N7mAqFDEBzOa7caFiXHhjF8GLYJ3RcnbT4U01KRQGuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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