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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840ae94fdc4ff3b9e746d59848c40ecdb6ce86ec1a598e3867750ae43d4a32e1' 
  AND token = 'DaIDeDJv0zlgfLQy+pMYJR7yqLcgaisL/PmGCOx29bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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