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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11da3ced01a0c619efaa21e03a11e0ad806ac599579f9177e2205ff8b9691f47' 
  AND token = 'fo/JCzWsTSZH1JguvBM461/Y+qLGMBSFv3xJE53vAOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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