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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915aff218a6d797053aea4bbb172f96207eba831efca20250cbc10e0ce6fa52f' 
  AND token = 'CrXmn6Kyfx6OTpkNt6WFxWiv2e3qEWhjXs1tdqEvkHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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