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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99dc7c4cb4fb4acf9162079e1b7fe3f08183bbcb7064b4129745fb59434bec2' 
  AND token = 'Qp4qpBX+GHeSx4/MiJN9rh+Q62FaCd+hvH0ApQinq/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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