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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402f674a605e03aa18ed99fc1bca4bed6602dde7238781e9893c9367f6d5463f' 
  AND token = 'i9aXhTBFDtTJgjr/3vmBl3rAj8zgrrOrmcfRbIahvVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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