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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d944555105c73e577e46894383f7d82c222dc801eab2b569ffc901f89c8721' 
  AND token = '9X7BQJTMI1w5aaqQ+GBuqN+gS118Su4KOK9Cw5UW8+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"
  }
}