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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9730ca6c96a75dc7d027e02424208a0c85342f779b9ee190b83a35a86dbaf8e' 
  AND token = 'NUruWDn8wHnSxfCQNl7O3qJAMyo5Aw5FYMHM+TbZTfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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