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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408f3f4a7e5231dcaa054be43c9bb2f3b791e63be469f327dfd410a4b7130b98' 
  AND token = 'kKjEI87//qLhiqTqXz2NlyC5retew8fPr0b6ZvaMP6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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