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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ffb6f886988eaf2738988bb4ff527b74257e5d95b301eb0780526a6f1d233a' 
  AND token = 'ksdS9RuXEzVU1dyD2OmszabQ/bdJHDQNgwSPt836W90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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