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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe74e9d67b7f7513433020ce9dcff652406870a46eb727b2756ca7be6f19811' 
  AND token = 'JthhlZRzh6NmYshKy+K6LnvKn/b3IhoQLisM6GoXWRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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