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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0315da7547f8024b8d7c3c0b723d468b4a23a7303f29e9decb68455f7383cb5d' 
  AND token = 'Q7YnNKa08b647HYgA4aS7uf72taWFrNI6ISl/bB5eIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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