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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651bd4d5ee0bb3ce2ed8ebba5475742b36df0b3a6f96441cd5afa841cecef90e' 
  AND token = 'kOLJLqN01Oeg2VpRNfLosVl20vxhuy68u9xkCZZHe5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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