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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f2633aaf42865e85365e05b96da2ae19cdd1abaf981801c57e55eb2196ce48' 
  AND token = 'lWI7LhJOS7+QLnO3cMSgTUktk0nHn30vBYGEQIokVJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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