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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132420ff22cf8c4c9022a26dbde1c76f8636da02daf26f32e7316d30078967cb' 
  AND token = 'FrgOhabpHHhDu3S3QGp4JVupblEILO5eA7eIa9u9AGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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