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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ccc8887f59a7787dc6ddf40d233c45e609703a9f191edde1d76160e1254ec3a' 
  AND token = 'hAJzRMP974T9JUz9hgw+cL3XvimiVboAwO1jl9QiUtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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