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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fabb3076b9a8ce5b35fbd4f4df1d12de12e7e92f400ca643705aa28587fc6d6' 
  AND token = 'i9eLKKJ/O0SIU4QHv3lS4SM/5tK+RDaTOrHRnTR1dfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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