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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927de1296c5c6d1c8050dba499c9cfa62b0735cd9f0722ab00490ad1fc319a8a' 
  AND token = 'wXwszkqEBKlj3Gbb9ltjqIB71VqSLJjveb/z1WeyHy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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