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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ff77205ab76c9de5f2659a7f780aab4e1afd91df8369f66483dcaa52968642' 
  AND token = '9DVqUX000lwP25H6IDeTxnOZbbrbkmL2IC1tR1dNOLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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