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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9a7dfd35950a27bbfc3041fccae7a53bfd6646b8ea2af4f8349c22f3fb61d7' 
  AND token = '8XOjfgZhPhzSJcoFTf43Pg4Qc2z22OlaAumec6b6PKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00176

JSON explain

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