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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099e9ab6556ca7ae5397273fd372a129bd83b4f40ac5033eff7dce44c534aff6' 
  AND token = 'Z/A6f2QLL09rN0A1aWE5gC5iLTcVFZBG9i+sEaG9A00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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