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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea8ea136afdc0308b801835a51107920e3276ba608767072045c5a0e6968e62' 
  AND token = 'nYiVkgaz91Mys+mOaVTDq8Q0YkzUc94pXcs6MKqERug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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