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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabe5478f02f66eb1add184d9362fa771c38d3dfcc1bdfd0a930da4298820f98' 
  AND token = 'micZfCuH8gPr76SjtSujhPEk45mz57/5Gxx7m3QtmFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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