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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5283463d08eee86d347c44a5e905a9093c8a2c014709e89b0259d2b106b5022d' 
  AND token = 'rH3swnv11/OqvC5OedjNiSumnRYPIJ4S61TFTCDDb+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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