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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ac5bb6d3d870d08de8c103debd93498070844319a443dd97bcfa0ff3f51146' 
  AND token = 't2nniND2WtzsjoPuqSPttXD88jhKtf57cxd2O2FYHfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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