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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98aa8ddd3f82fca6d0fec1cdca8f1e69984490eac6a826f0233abcf4ce507cc0' 
  AND token = 'w4n0e5j1U4zED1c5007ne8wqMMmqagjcTD4LbskDrFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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