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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd237bfc1ed502cb5d6d69ebd82049fdb1d99a33e3a73e5b757d82b3b074e5291' 
  AND token = 'aXwcVEzUz5f7bDrC6907DgUAu5WgtSsmSqnCjrZjNBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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