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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699b14e8f2c4e987b74a91bb4f6e6593acaa1b8a98a5a094671c7f4c7c53ac86' 
  AND token = 'NUZkAkBcetBDEn64sZsFU5Lo34V1V3xAbRxaLq5sd/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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