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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b358b44d59e5e48721462071745c4fcceb2d39db33b567b71d0eae120a5b8a1' 
  AND token = '/Ns62MnDVgrmsG1tdGSMX8Lk5uVn/EEBSVUpK76lbHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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